Have you gotten any more progress? I have gotten an answer but nowhere near 1697 or 1526. I would recommend splitting up the equation into the x and y components. As you probably have already done. Also when doing it make sure that you are using the correct angle.

Please show your workings so we can better assist in finding your errors. Might be due to an error in detremining force components ( as has been pointed out), or might be an error in the pesty plus or minus sign,...or both.

Figured it out...and of course it was something stupid...I forgot to add the negatives to the numbers that needed it...I just figured I didn't need them since I was finding the magnitude anyways, but of course that affects the x and y resultant that you square

I find it quite easy to always use force triangles when given problems like this since its always easy to make mistakes when resolving( you have more equations obviously high chances of sign mistakes)... wherez you could pplug all the values in one geometric equation and instantly find the magnitude and direction! :)